Rolling-in tool for tubes



Sept. 28 1926. 1,601,329

0. SLESAZECK nonmue IN TOOL FOR TUBES Filed April 12, 1926 mm fiuu FIG.\

a i h FIGB Fl (5.5 y

Patented SeptJZB, 1926.

T OFFICE.

cam. smsazn'c'x, or 32mm, GERMANY.

ROLLING-IN roor. ron Turns.

Application filed April 12, 1926, Serial No. 101,458, and in GermanyApril 17, 1925.

My invention relates to a tool for the tight rolling-in of'tubes intoboiler heads, fire boxes, and. the like, the rolling-in being effectedin known manner by rollers or rolls '-genera11y three--pressed radiallyoutwards by means-of the conical portion of a conical mandrel adapted tobe shifted axial ly by a screw-thread provided upon the shank of saidmandrel. The known tube rolling-in devices of this type suffer from thedrawback that the more or less good rolling-in depends u on theattention of the workman who re ies so-to-say upon his tactilityso thatthe tubes or tube ends are expanded sometimes either too little in whichcase the tightness is insuflicient, or too much in which case the boilerhead is caused to warp so as to lose its proper shape.

The improved rolling-in device forming the subject-matter of the presentinvention is free from those drawbacks. Its gist resides in the featuresthat between the roller cage and the mandrel shank an engaging anddisengaging coupling is inserted which is disengaged automatically whenthe radial pressure of the rollers upon the tube end to be rolled-in,and, therefore, upon the conical portion of the mandrel, has attained acertain height. The labor is now rendered independent of the skill ofthe workman, and every tube end is rolled-in equally tight- 1yanduni'formly at every portion of its circumference. The invention isillustrated diagrammatically and by way of examples in the accompanyingdrawing on which Figure 1 is a longitudinal section through the firstexample, only the mandrel being-shown in sideview; Figure 2 is across-section in the plane AB of Fig. 1; Figure 3 is a longitudinalsection through another constructional formand Figs. 4, 5 and 6 showsome modified details, drawn to an enlarged scale, all as more fullydescribed hereinafter.

, On the drawing, 0, Fig. 1, denotes the roller cage which is providedwith three longitudinal slots in which three rollers 6, Figs. 1 and 2,are housed. The cage is screwed intoone end of a casinga; into the otherend of this casing is screwed a ring v. d denotes the conical portion ofthe mandrel which can be moved forward axially by means of its threadedshank e and its square rear end 8 either manually or with the aid of anyauxiliary device. The thread of the shank e engages an internal threadprovided in the rear end of a sleeve .f having a thick flange .at itsfront end and being, encompassed by a strong helical spring 71 pressinwith its front end against said flange an with its rear end against thering 41.

. A'thick flange is provided also at the'rear end ofthe roller cage 0.This flange is located in the front end of the casing a, and providedwith some bores enclosing shanks '9 of pins 0 having oblique heads, asshown.

Opposite these pins similar pins ;0 are inserted with their shanks minto bores of a flangeof the sleeve 7. I wish it, however, to beunderstood that instead of a plurality of pins 9/0 and m /p only some ineach of the two flanges may do.

The sleeve is shiftable in the casing a together with the mandrel. Itsnormal position within the casing is not that shown in Fig. 1. Theposition shown in this figure is that in which the mandrel or, moreprecisely, its conical working end, is just being withdrawn from therollers b. When the rolling-in work is being commenced, the pins 1) lielaterally. from the pins 0, side by side with them, so that theytransmit the rotary motion of the sleeve f to the cage 0 and the rollers12 by the intermediary of the pins ,0.

The pins 9 and p constitute, in fact, a'coupling, a pin coupling. Whenthe tube has been end rolled-in tightly. by the' rollers 11, theresistance increases so much that the pins 72 slide off the pins 0 alongtheoblique surfaces of. the heads ofboth pins, or sets of pins, the pins;0 and the sleeve f being I forced rearwardly so -as to compress thespring 2' correspondingly. The workman perceives, of course, at oncethis condition which indicates to him that the proper tight rolling-inhas been finished, whereupon he.

withdraws his tool.

In the modification shown in Fig. 3, the direction of theconicalnessof'the working end of the mandrel-is the reverse of that inFig. 1, and the position of the spring 2' on one hand and of the pins 0and p on the other hand is also the reverse of the position of theseparts in Fig. 1. While in this latter figure the pins are locatedlefthand'from he. spring, they are located, in Fig. 3 rightiand thereof.The spring 11 presses on its fthand end, against the cage 0, and on itsrighthand end against a flange h of a short sleeve t having the internalthread for the lit) shank of the mandrel. Also with this constructionalform of the tool the members forming the pin coupling are disengagedautomatically as soon as the proper tight rolling-in of the tube-end hasbeen efiected, the position of the pins in this moment being then thatshown in Fig. 3.

While in Fig. 1 a ring 1) and in Fig. 3 a

ring u is screwed into the casing (1, Figs. 4, 5 and 6 show amodification in which a capnut 70 is employed instead of said rings.This cap nut which, as such, is to be screwed upon the respective end ofthe casing a instead of thereinto, carries the pins q, as shown in Fig.5. Supposing this figure be turned for 90 in clockwise direction, theposition of the each other will correspond to the position of the samepins in Fig. The position of the cap nut is and the flange h in Fig. 4corresponds to the position of the same parts in Fig. 5, these partsbeing, however, shown in side-view instead of in axial section. AlsoFig. 6 shows these parts in side-view, but in that position of themrelatively to each other which'they occupy when the rolling-in operationis commencing, the coupling pins lying then side by side. I

I wish it also to be understood that the pin-coupling is illustratedmerely by way' ot example. There are other suitable coupling memberswhich may be used as well.

I claim:

L'Arolling-in tool for tubes, comprising, in combination, a casing, acage and rollers therein, a mandrel extending. through said casing andbeing adapted taco-operate at one end with said rollers, and beingconical at this end, and having a screw-thread on its shank; and anautomatically engaging and disengaging coupling arranged between saidcage and said mandrel, substantially as set forth.

2. A rolling-in tool for tubes, comprising, in combination, a casing, acage and rollers therein, a mandrel extending through said casing andbeing adapted to co-operate'at one end with said rollers, and beingconical pins 9 and n relatively to at this end, and having ascrew-thread on itsshank; and an automatically engaging and disengagingcoupling comprising pins liocated opposite to each other and havingheads with oblique surfaces adapted to slide along each other,substantially as set "forth.

3. A rolling-in tool for tubes, comprising, in combination, a casing, acage and rollers therein, a mandrel extending through said casing andbeing adapted to co-operate at one end with said rollers, and beingconical at thisend, and' having a screw-thread on its shank; and anautomatically engaging and disengaging coupling, an internally threadedsleeve encompassing the threaded portion of the shank; saidautomatically engaging and disengaging coupling comprising pins locatedopposite to each other and having heads with oblique surfaces adapted toslide along each other; and a spring located inside said casing andbeing so arranged as to be adapted to make the coupling pins engage oneanother, substantially as set forth.

4. A rolling-in tool for tubes, comprising, in combination, a casing, acage located at one end of said casing, and rollers located in saidcagef a cap-nut screwed upon the other end of the casing; a mandrelextending through the said casing and being adapted to co-operate at oneend with said rollers, and being conical atthis end, and having ascrew-thread on its shank; the conical portion of the mandrelenlargiijig' from the shank portion to its free end; an auton'laticallyengaging and disengaging coupling comprising pins extending forthinwardly from said cap-nut, and oppositely located pins, all pins havingheads with oblique surfaces adapted to slide along each other; and aspring located inside said casing and being so arranged as to beadapted. to make the coupling pins engage one another, substantially asset forth. 7

In testimony whereof I afiix my signature.

CARL SLESAZECK.

